如何在Swift中从JPEG中提取深度

Question

以下代码似乎无法从图像中提取深度数据（包含深度信息）。代码在＆＃34; guard {auxdepthinfo -...）＆＃34;之后返回nil。线。在以下代码中，图像是对存储在photoAlbum中的肖像图像的引用。

struct DepthReader {
    var image: UIImage

    func depthDataMap() -> CVPixelBuffer? {
        //create data from UIImage
        guard let imageDat: Data = UIImageJPEGRepresentation(image, 1.0) else {
            return nil
        }

        //create source
        guard let source = CGImageSourceCreateWithData(imageDat as CFData, nil) else {
            return nil
        }

        //extract auxData disparity data
        guard let auxDataInfo = CGImageSourceCopyAuxiliaryDataInfoAtIndex(source, 0, kCGImageAuxiliaryDataTypeDepth) as? [AnyHashable : Any] else {
            return nil
        }

        // This is the star of the show!
        var depthData: AVDepthData

        do {
            // Get the depth data from the auxiliary data info
            depthData = try AVDepthData(fromDictionaryRepresentation: auxDataInfo)
        } catch {
            return nil
        }

        // Make sure the depth data is the type we want
        if depthData.depthDataType != kCVPixelFormatType_DisparityFloat32 {
            depthData = depthData.converting(toDepthDataType: kCVPixelFormatType_DisparityFloat32)
        }
        return depthData.depthDataMap
    }
}